Isocyanate group-terminated urethane prepolymer, process for...

Details Isocyanate group-terminated urethane prepolymer, process for... Isocyanate group-terminated urethane prepolymer, process for...

2011-03-15

2011-03-15

Sergent, Rabon (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C252S182200, C252S182220, C528S083000, C528S905000, C560S025000, C560S026000, C560S359000

Reexamination Certificate

active

07906607

ABSTRACT:
It is an object of the present invention to provide an isocyanate group-terminated urethane prepolymer which has a low viscosity at melting and a process for producing the same, and an adhesive which comprises the urethane prepolymer. The invention relates to a process for producing an isocyanate group-terminated urethane prepolymer which comprises reacting polyols with a polyisocyanate compound, wherein the polyols comprise 10 to 50% by mass of a polyester polyol and 90 to 50% by mass of a polycarbonate polyol and wherein a sebacic acid-derived polyester polyol which is a polycondensate of sebacic acid with a diol compound accounts for 50 to 100% by mass of the polyester polyol and wherein the polyisocyanate compound and the polyols are reacted in such amounts that the ratio (by mol) of the isocyanate group/hydroxyl group is 1.2 to 3.2.

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